We're on the edge of our seats for David Tennant's final Doctor Who two-parter after the intense and terrifying ending to "The Waters Of Mars." And the first official clip shows the Tenth Doctor putting up a brave front.

BBC America, which posted this clip just now and sent us the above still (click to enlarge!), also announced that "The End Of Time, Part 1" will air in the U.S. on December 26, just the day after it appears in the U.K. And the airdate for Tennant's final hour will be announced very soon.